docs: def chmod(hdfs_path, mode, user=None):
      """
      Change file mode bits.
  
      :type path: string
      :param path: the path to the file or directory
      :type mode: int
      :param mode: the bitmask to set it to (e.g., 0777)
      """
      host, port, path_ = path.split(hdfs_path, user)
      fs = hdfs(host, port, user)
      retval = fs.chmod(path_, mode)
      fs.close()
      return retval